Ariana's song choice came as a surprise even to her own mother Joan Grande, who revealed the backstory to the singer's connection to the "Wizard of Oz" song to Variety.

"The atmosphere in that stadium was just unbelievable all night, start to finish", he said.

"I didn't know she was going to sing it", Joan Grande told Variety.

"We had a totally different show planned than we had in rehearsal yesterday".

Singer-songwriter John Legend Tweeted a thank you to Grande who set up the benefit concert.

Grammy victor Usher, who was featured on the benefit's bill - along with Katy Perry, Miley Cyrus, Justin Bieber and more - never actually took the stage on Sunday.

Susanna added: "She also said that when she met you she was in tears and you said Olivia would have had something to say about that".

Most 23-year-old singers would be catatonic after a terrorist attack at one of their concerts, but Ariana Grande bounced back to help Manchester heal.

That brings the total raised by the British Red Cross' "We Love Manchester Emergency Fund" to almost $13 million. I love you guys so much, and I think that all the love and unity you're displaying is the medicine the world needs right now. One was Grande's highly talked-about performance of her song "My Everything" with the local Parrs Wood High School choir.

"Manchester we're strong ... we're still singing our song", he sang with the audience of 50,000.

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